Recent climate change and the increase in unpredictable meteorological disasters has continue to damage greenhouses. Although structural safety standards have been established, they do not fully reflect the environment where greenhouses are installed. Existing standard greenhouse designs assume that the boundary conditions are fixed, even though the real boundaries move due to the absence of foundations. In this study, a structural analysis model was developed that reflects the ground conditions for pipe structures installed without a foundation, and their structural safety was reviewed under various levels of snow load. The structural analysis model was developed by applying the prescribed displacement and rotation boundary, using values derived from an experiment that was performed considering loading and ground conditions. The developed model was compared with the existing methods considering only fixed and hinged boundaries by examining the bending moments and the axial forces. As the boundary at the ground moved according to the applied load, the maximum bending moment reflecting the ground conditions was larger than the result from the fixed boundary. Additionally, as the load is gradually increased, the stress calculated reflecting the ground conditions was larger than the result from the hinged boundary. Safety review indicated that the marginal snow depth that could be sustained by the structure decreased by up to 25% when the ground condition was reflected. These results suggest that the current structural analysis methods applied to pipe greenhouse structures with no foundations could lead to the structure being under designed.

中文翻译：

---

开发管道结构的结构分析模型以反映地面条件

最近的气候变化和不可预测的气象灾害的增加继续破坏温室。虽然已经建立了结构安全标准，但它们并不能完全反映安装温室的环境。现有的标准温室设计假设边界条件是固定的，即使实际边界由于没有地基而移动。在这项研究中，开发了一种结构分析模型，该模型反映了无基础安装的管道结构的地面条件，并在不同级别的雪荷载下对其结构安全进行了审查。结构分析模型是通过应用规定的位移和旋转边界开发的，所使用的值是在考虑载荷和地面条件的情况下进行的实验得出的。通过检查弯矩和轴向力，将开发的模型与仅考虑固定和铰接边界的现有方法进行比较。由于地面边界根据施加的载荷移动，反映地面条件的最大弯矩大于固定边界的结果。此外，随着载荷逐渐增加，反映地面条件的计算应力大于铰接边界的结果。安全审查表明，当反映地面状况时，该结构可承受的边际积雪深度减少了 25%。这些结果表明，当前应用于无基础管道温室结构的结构分析方法可能导致结构设计不足。